Huawei · 9.1.2

Huawei argues against the necessity of phase information for AI/ML model input, citing that double phase difference cannot mitigate phase errors in NLOS scenarios and that timing/power suffices for performance. They oppose the introduction of an 'associated ID' for TRP location consistency (Alternative 1/2), presenting a technical case that TRP locations are infrequent to change and that UE-side burden from combinatorial model training would be excessive; instead, they support Alternative 3 where Info #7 is not provided. For model output, Huawei proposes reusing legacy IEs for LOS/NLOS indicators and suggests distinguishing Rel-19 timing information via timing quality indicators or a specific Rel-19 type indicator. Regarding monitoring, they propose that label-free monitoring be up to implementation and that for Case 3a, the reporting of measured versus non-measured results can implicitly signal model activation or fallback. Finally, they support functionality-based lifecycle management for UE-side models using legacy capability reporting procedures.

Huawei argues that ambiguity in sample-based measurements for Case 3b can be avoided by implementation rather than strict specification, proposing that gNBs flexibly determine selection window parameters (Nt, Nt', k) while capping Nt' at 16 and Nt at 64 to protect proprietary channel estimation. They support enhancing legacy path-based reporting by increasing the number of reported paths to 16, citing simulation results showing sub-meter accuracy improvements. For Case 3a, they propose reusing the legacy 'LoS/NLoS Information' IE and distinguishing AI/ML timing outputs via timing quality indicators or new Rel-19 indicators. Regarding Case 1, they oppose introducing new positioning methods or implicit signaling, insisting on reusing legacy DL-TDOA assistance data explicitly. For monitoring, they argue that LMF involvement in Case 1 metric calculation is unnecessary and that Case 3a monitoring should rely on measured/non-measured result reporting to imply activation/fallback.